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Home > Help Needed / General Tech Chat > GT17 - too much boost | |||||||
8 Posts Member #: 11596 Junior Member Kent |
19th Mar, 2018 at 08:59:00pm
Hello everyone,
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6743 Posts Member #: 828 Post Whore uranus |
19th Mar, 2018 at 09:07:27pm
check the pre load ? Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM |
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8 Posts Member #: 11596 Junior Member Kent |
19th Mar, 2018 at 09:13:17pm
How should it be set? When I fitted it, I did it so it only just held the little poppet valve shut. So the rod wasn't exactly tight to fit on the turbo. When I test the actuator with mityvac, the actuator rod only just starts to move at 17psi. I've only just taken it down the road for the first time tonight - only to put fresh petrol in it really, the map is nowhere near right - and when the boost came on I very quickly saw around 15psi on the gauge |
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
19th Mar, 2018 at 10:21:58pm
Where is the feed for the actuator being taken from?
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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11046 Posts Member #: 965 Post Whore Preston On The Brook |
19th Mar, 2018 at 11:04:24pm
If your Mitty vac is showing 17psi at the point it starts to move the pushrod with the actuator on the bench, I’d say the actuator is faulty or the wrong one for the turbo.
On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
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Forum Mod 10979 Posts Member #: 17 ***16*** SouthPark, Colorado |
19th Mar, 2018 at 11:12:06pm
It could simply be this is way too strong of an actuator.
On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY |
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238 Posts Member #: 11017 Senior Member Shropshire |
20th Mar, 2018 at 01:28:58pm
take off the actuator arm from the exhaust housing and you're looking for half a hole for pre-load.
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9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
20th Mar, 2018 at 02:46:29pm
ok. I might have one of these actuators spares as I've used a few Chinese GT17s but never used the actuators.
Fastest 998 mini in the world? 13.05 1/4 mile 106mph
On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination, talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry. |
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8 Posts Member #: 11596 Junior Member Kent |
21st Mar, 2018 at 07:57:09am
Thanks everyone. I went back to it yesterday and checked it over again. The pipe is a decent bore and done up tight at both ends, I ran it from the fitting on the compressor housing which was how the turbo was set up when it arrived. I'm sure you're right and the actuator is just wrong - it just seemed odd! Everywhere I searched said these saab turbos were set for around 5psi. Maybe I put too much faith in Chinese turbo manufacturers.
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2974 Posts Member #: 10749 Post Whore lowestoft suffolk |
21st Mar, 2018 at 01:20:04pm
And what does said mini look like so i can spy it on sunday? On 24th Oct, 2015 jonny f said:
Nothing gets past Dave lol NOTHING GETS PAST ME!! 1/4 mile 14.7 @ 96mph 12psi boost Showdown class A 2nd place 18.6 @ 69mph |
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8 Posts Member #: 11596 Junior Member Kent |
23rd Mar, 2018 at 12:03:38am
Well I bought an actuator for a T3 from ebay. Description said it opened at 5.4psi so I thought perfect. It looked physically the same in the pictures. Turns out it's actually quite a bit bigger than the GT17 one so a bit of modification to my actuator bracket was in order - oops. Anyway sorted that out and set it with approx 1/2 a hole pre-load (I say approx because it's a little difficult to tell when the engine's in and you're looking down on it). Took it out tonight for about 2 hours of mapping and it seems to be perfect as it is - I'm seeing a maximum of 10psi on the gauge. Maybe I set the pre-load a little tight? I don't know.
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Site Admin 15300 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
23rd Mar, 2018 at 09:02:38am
To be honest chap if you've got it running and driveable I'd spend the time refining what is there rather than trying any other base map. Base map is a grand term for an educated guess to be honest and the chances are that any other base map will be worse than what you have got to already.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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8 Posts Member #: 11596 Junior Member Kent |
23rd Mar, 2018 at 10:16:42pm
I take your point. I have got it driving reasonably and it's safe enough until it gets to the rolling road. Seems to be on the rich side, except for the moment I press the accelerator. Pulling away is a pain. It goes lean for a second or two then picks up, and I am struggling to improve it. The 'acceleration multiplier' seems to make little difference whatever I do with it and doesn't make sense to me. In every base map I have, all the numbers in that table are well below zero. Surely if it is a multiplier to richen the mixture when you press the accelerator, they need to be above 1, to increase the final injection pulse width? I was going to ring specialist components this afternoon and ask a few questions but it seems the part timers go home at 12 on Fridays!! |
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Site Admin 15300 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
23rd Mar, 2018 at 10:25:22pm
I can’t help you much as when I briefly had a mess with the SC ECU software I found it awful to use and difficult to make it do what I wanted.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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8 Posts Member #: 11596 Junior Member Kent |
23rd Mar, 2018 at 11:00:38pm
Well, I don't have anything to compare it to, but I am inclined to agree! It often seems to glitch out and just refuse to accept the values you put in. Or you'll enter a value into a cell and it will change it, but not quite to the value you entered. I'm hoping the rolling road operator is going to have more success with it than me. |
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